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Financial Instruments - Summary of Timing of Undiscounted Cash Outflows Relating to Financial Liabilities (Detail) - CAD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |
Trade and other payables | $ 567.2 | $ 704.6
Long-term debt | 935.4 | 740.8
Other financial liabilities | 3.1 | 10.9
Total contractual obligations | 1,505.7 | 1,456.3
Within one year [member] |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |
Trade and other payables | 567.2 | 704.6
Long-term debt | 49.1 | 198.4
Other financial liabilities | 1.1 | 1.8
Total contractual obligations | 617.4 | 904.8
Later than one year and not later than three years [member] |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |
Long-term debt | 196.7 | 541.4
Other financial liabilities | 0.3 | 7.5
Total contractual obligations | 197.0 | 548.9
After 3 years [member] |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |
Long-term debt | 689.6 | 1.0
Other financial liabilities | 1.7 | 1.6
Total contractual obligations | $ 691.3 | $ 2.6

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